PTC (Positive Temperature Coefficient) heating assembly for commercial dish-washing machine

Abstract

The PTC heating assembly for the commercial dish-washing machine comprises a cylinder body, the interior of the cylinder body is sequentially divided into a water inlet cavity, a mixing cavity and a water outlet cavity in the length direction of the cylinder body, and a water inlet pipe communicated with the water inlet cavity and a water outlet pipe communicated with the water outlet cavity are arranged on the side wall of the cylinder body. A water passing channel is formed between every two adjacent cavities in the water inlet cavity, the mixing cavity and the water outlet cavity, a PTC heating pipe axially extending to the water inlet cavity, the mixing cavity and the water outlet cavity is detachably connected to the barrel, and a first detection element and a second detection element which are used for detecting the water temperature of the water inlet cavity and the water temperature of the water outlet cavity respectively are further connected to the side wall of the barrel; when the water temperature of the water inlet cavity is lower than a first set value, the PTC heating pipe starts to heat, and when the water temperature of the water outlet cavity is higher than a second set value, the PTC heating pipe stops heating. The PTC heating assembly for the commercial dish washing machine is simple in structure, heating time control is accurate, and the water temperature of the water outlet pipe can be kept constant within a certain range all the time.

Description

Technical Field

[0001] The utility model relates to the technical field of commercial dishwashers, and more specifically, to a PTC heating component for a commercial dishwasher. Background Art

[0002] A commercial dishwasher is a new type of tableware cleaning device for kitchens, mainly used in kitchens with a large amount of tableware cleaning, such as schools, hotels, enterprises, military units, tableware disinfection companies, etc. Compared with manual cleaning, commercial dishwashers have the advantages of high cleaning efficiency, reduction of labor costs, and solution to the problem of insufficient tableware supply.

[0003] Commercial dishwashers generally have multiple cleaning areas, such as preliminary rinsing, main washing, and rinsing. Some dishwashers also have drying and disinfection functions. Moreover, each cleaning area has a corresponding temperature. The preliminary rinsing is generally directly rinsed with tap water at normal temperature. The main washing is carried out by the water in the main washing tank, and the water temperature is generally between 58 and 78 °C. The rinsing is specifically supplied with water through a rinsing channel, and the water temperature is generally between 85 and 96 °C. The high-temperature rinsing water can also play a certain disinfection role.

[0004] For example, a fast energy-saving heating package for a commercial dishwasher disclosed in Chinese Patent CN211796296U realizes the function of fast energy-saving heating through reasonable design, and it can be applied to quickly heat the rinsing water in the rinsing channel. The heating package disclosed in this patent includes a device main body, on the outer side wall of which there are a water inlet pipe and a water outlet pipe, and a heating mechanism is arranged inside the device main body. In this structure, the inner cavity of the device main body is a single chamber. When in use, corresponding cold water is added into the device main body, and then it is heated to the set temperature by the heating mechanism, and the water outlet pipe is communicated with the rinsing nozzle. As the rinsing progresses, it is necessary to continuously supplement external cold water from the water inlet pipe. Since the inner cavity of the device main body is a single chamber, the externally supplemented water directly mixes with the original hot water after entering the device main body, which easily causes large fluctuations in water temperature, resulting in the water temperature of the hot water sprayed by the rinsing nozzle not being able to be kept constant within a small range, affecting the rinsing effect. On the other hand, due to large fluctuations in water temperature in different regions of the device main body wall, the control feedback for the start and stop timing of the heating element is not very accurate. Summary of the Utility Model

[0005] To overcome at least one defect in the above prior art, the utility model provides a PTC heating component for a commercial dishwasher, which has a simple structure, accurate control of the heating timing, and can keep the water temperature of the water outlet pipe constant within a certain range.

[0006] The utility model provides a PTC heating component for a commercial dishwasher, which comprises a cylinder body. The cylinder body is sequentially divided into a water inlet cavity, a mixing cavity and a water outlet cavity along its length direction. A water inlet pipe communicated with the water inlet cavity and a water outlet pipe communicated with the water outlet cavity are arranged on the side wall of the cylinder body. There are water passing channels between adjacent chambers among the water inlet cavity, the mixing cavity and the water outlet cavity. A PTC heating pipe axially extending into the water inlet cavity, the mixing cavity and the water outlet cavity is detachably connected to the cylinder body. First detection elements and second detection elements for respectively detecting the water temperatures of the water inlet cavity and the water outlet cavity are also connected to the side wall of the cylinder body. When the water temperature in the water inlet cavity is lower than a first set value, the PTC heating pipe starts to heat. When the water temperature in the water outlet cavity is higher than a second set value, the PTC heating pipe stops heating.

[0007] Compared with the prior art, the PTC heating component for a commercial dishwasher of the utility model has the following advantages:

[0008] The PTC heating pipe is adopted for heating, and its heat energy conversion efficiency can reach 99%. Compared with the heating efficiency of about 75% of the old-fashioned resistance wire heating pipe, the heating efficiency can be increased by about 25%. Moreover, the PTC heating pipe has the characteristic of preventing dry burning and is not easily damaged. After the cylinder body is filled with water, heating starts until the required temperature is reached, and then high-temperature water is discharged through the water outlet pipe for use. The whole device is divided into three areas by a perforated partition, namely a low-temperature area, a mixing area and a high-temperature area. When the temperature read by the temperature probe in the low-temperature area is lower than a certain temperature value, the PTC heating pipe starts to work for heating. When the temperature in the high-temperature area is higher than a certain temperature value, the PTC heating pipe stops heating. This structure can keep the temperature of the water outlet pipe constant within a certain range.

[0009] As an improvement, two partitions spaced along the length direction are connected to the inner cavity wall of the cylinder body to divide the inner cavity of the cylinder body into a water inlet cavity, a mixing cavity and a water outlet cavity. First mounting holes for the PTC heating pipe to pass through are respectively opened in the middle parts of the two partitions. A plurality of communication holes are also arranged on each partition to form the water passing channels.

[0010] As a further improvement, the cylinder body comprises a hollow round pipe, end covers are respectively connected to both ends of the round pipe. A second mounting hole for the PTC heating pipe to pass through is opened in any one of the end covers. One end of the PTC heating pipe is connected with a connecting flange, and the connecting flange is detachably connected to the end cover provided with the second mounting hole.

[0011] As a further improvement, the first detection element and the second detection element are both temperature sensing probes, and the detection ends of the two temperature sensing probes respectively penetrate through the side wall of the cylinder body and extend into the water inlet cavity and the water outlet cavity.

[0012] Further improved, the cylinder body is horizontally arranged along its length direction, and a drain bolt communicating with any one of the chambers is further provided on the side wall of the bottom of the cylinder body.

[0013] Other improved features and advantages of the present utility model will be described in the subsequent specific embodiments, and part of them will be obvious from the description or understood by implementing the present utility model. The objectives and other advantages of the present utility model can be achieved and obtained through the structures specifically pointed out in the description and the drawings. Description of the Drawings

[0014] Figure 1 is a three-dimensional structure diagram of the PTC heating component for a commercial dishwasher of the present utility model;

[0015] Figure 2 is a cross-sectional view of the PTC heating component for a commercial dishwasher of the present utility model.

[0016] Description of the Reference Numerals:

[0017] 1, water inlet chamber; 2, mixing chamber; 3, water outlet chamber; 4, water inlet pipe; 5, water outlet pipe; 6, water passage; 7, PTC heating pipe; 8, first detection element; 9, second detection element; 10, partition board; 11, round pipe; 12, end cover plate; 13, connecting flange; 14, drain bolt. Detailed Description of the Embodiments

[0018] First of all, those skilled in the art should understand that these embodiments are only used to explain the technical principles of the embodiments of the present application and are not intended to limit the protection scope of the embodiments of the present application. Those skilled in the art can make adjustments according to needs to adapt to specific application scenarios.

[0019] In the description of the embodiments of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "fixed" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific situations.

[0020] The present application will be further described in detail below with reference to the drawings and specific embodiments.

[0021] See Figure 1 、 Figure 2As shown in the figure, an embodiment of the present application discloses a PTC heating component for a commercial dishwasher, which includes a cylinder body. The cylinder body is sequentially divided into a water inlet chamber 1, a mixing chamber 2, and a water outlet chamber 3 along its length direction. And a water inlet pipe 4 communicating with the water inlet chamber 1 and a water outlet pipe 5 communicating with the water outlet chamber 3 are provided on the side wall of the cylinder body. And there is a water passing channel 6 between adjacent chambers among the water inlet chamber 1, the mixing chamber 2, and the water outlet chamber 3. Additionally, a PTC heating pipe 7 axially extending into the water inlet chamber 1, the mixing chamber 2, and the water outlet chamber 3 is detachably connected to the cylinder body. A first detection element 8 and a second detection element 9 for respectively detecting the water temperatures of the water inlet chamber 1 and the water outlet chamber 3 are also connected to the side wall of the cylinder body. Specifically, a corresponding controller will be provided in the heating device, and the first detection element 8, the second detection element 9, and the PTC heating pipe 7 are all electrically connected to the controller. That is, when the first detection element 8 detects that the water temperature in the water inlet chamber 1 is lower than the first set value, it will transmit a signal to the controller, and the controller controls the PTC heating pipe 7 to start heating. And when the second detection element 9 detects that the water temperature in the water outlet chamber 3 is higher than the second set value, the second detection element 9 feeds back the signal to the controller, and the controller controls the PTC heating pipe 7 to stop heating, so as to ensure that the temperature of the water outlet pipe 5 always remains constant within a certain range. Additionally, in the above structure, the chambers in the cylinder body are divided into three regions, namely a low-temperature region, a mixing region, and a high-temperature region. A water outlet pipe 5 connected to a rinsing nozzle is provided on the side wall of the cylinder body corresponding to the high-temperature region, that is, to ensure that the rinsing nozzle sprays hot water with a constant temperature within a certain range. And while the water outlet pipe 5 discharges water, the water inlet pipe 4 will supplement cold water. The supplemented cold water will not directly mix into the high-temperature region, but first slowly flow to the mixing region. Therefore, the supplemented external cold water will not cause too large a fluctuation in the temperature of the high-temperature region. And as the cold water is supplemented by the water inlet pipe 4, when the temperature in the low-temperature region is lower than the first set value, the PTC heating pipe 7 will start to work. And under the action of the second detection element 9, the PTC heating pipe 7 will not keep heating, but stop heating when the temperature in the high-temperature region reaches the second set value, so as to better ensure the constancy of the temperature of the water outlet pipe 5, and the fluctuation range is very small.

[0022] In this embodiment, referring to the appendix again Figure 2 , two partitions 10 are connected to the inner cavity wall of the cylinder body at intervals along its length direction. Here, the two partitions 10 are welded and fixed to the inner cavity wall of the cylinder body. The two partitions 10 are used to divide the inner cavity of the cylinder body into independent water inlet chamber 1, mixing chamber 2, and water outlet chamber 3. First mounting holes for the PTC heating pipe 7 to pass through are opened in the middle of the two partitions 10. And a plurality of communication holes are provided on each partition 10 to form the water passing channel 6. Preferably, the communication holes are circular through holes, and the hole diameter is controlled within 0.5 - 1 cm. The area of the water passing channel 6 here cannot be too large to slow down the time for the cold water in the water inlet chamber 1 to enter the mixing chamber 2 and the water outlet chamber 3, and avoid large fluctuations in the water outlet chamber 3 stability.

[0023] In this embodiment, preferably, the cylinder body includes a hollow circular tube 11, and end covers 12 are respectively connected to both ends of the circular tube 11. Specifically, the two end covers 12 are both fixedly welded to both ends of the circular tube 11, and a second mounting hole for the PTC heating tube 7 to pass through is formed in any one of the end covers 12. One end of the PTC heating tube 7 is connected with a connecting flange 13, and the connecting flange 13 is detachably connected to the end cover 12 provided with the second mounting hole, so as to realize the detachable connection between the PTC heating tube 7 and the cylinder body, which is convenient to disassemble the PTC heating tube 7 to clean its outer wall and ensure the heating efficiency. More specifically, corresponding mounting holes are provided at the central positions of the two end covers 12 and the two partition plates 10 to ensure that the PTC heating tube 7 is located at the central position of the cylinder body after installation, so that it can heat the water in each chamber more evenly.

[0024] In addition, in the above structure, the first detection element 8 and the second detection element 9 are both cylindrical temperature sensing probes, and the two temperature sensing probes are connected along the direction perpendicular to the outer wall of the circular tube 11, and the detection ends of the two temperature sensing probes respectively pass through the side wall of the cylinder body and extend to the central positions of the water inlet chamber 1 and the water outlet chamber 3 to more accurately obtain the real-time water temperatures of the water inlet chamber 1 and the water outlet chamber 3.

[0025] In this embodiment, when the PTC heating assembly is working, the cylinder body is horizontally arranged along its length direction, and is fixedly connected to the rack of the dishwasher by setting corresponding fixed bases on its outside, and a drain bolt 14 communicating with any one of the chambers is also provided on the side wall of the bottom of the cylinder body. When the PTC heating assembly is not used for a long time, the water in the cylinder body can be drained in time through the drain bolt 14 to improve the service life of the device.

[0026] In the description of the present application, the descriptions referring to terms such as "this embodiment", "some embodiments", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, without conflict, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples.

[0027] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present application should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A PTC heating component for a commercial dishwasher, characterized in that: It includes a cylinder body, and the interior of the cylinder body is sequentially partitioned into a water inlet chamber (1), a mixing chamber (2), and a water outlet chamber (3) along its length direction. A water inlet pipe (4) communicating with the water inlet chamber (1) and a water outlet pipe (5) communicating with the water outlet chamber (3) are provided on the side wall of the cylinder body. And there are water passing channels (6) between adjacent chambers among the water inlet chamber (1), the mixing chamber (2), and the water outlet chamber (3). A PTC heating pipe (7) axially extending into the water inlet chamber (1), the mixing chamber (2), and the water outlet chamber (3) is detachably connected to the cylinder body. A first detection element (8) and a second detection element (9) for respectively detecting the water temperatures of the water inlet chamber (1) and the water outlet chamber (3) are also connected to the side wall of the cylinder body; when the water temperature in the water inlet chamber (1) is lower than a first set value, the PTC heating pipe (7) starts to heat, and when the water temperature in the water outlet chamber (3) is higher than a second set value, the PTC heating pipe (7) stops heating.

2. The PTC heating component for commercial dishwashers according to claim 1, characterized in that: Two partitions (10) spaced along its length direction are connected to the inner cavity wall of the cylinder body to partition the inner cavity of the cylinder body into a water inlet chamber (1), a mixing chamber (2), and a water outlet chamber (3). First mounting holes for the PTC heating pipe (7) to pass through are provided in the middle of the two partitions (10), and a plurality of communication holes are also provided on each partition (10) to form the water passing channels (6).

3. The PTC heating component for commercial dishwashers according to claim 1 or 2, characterized in that: The cylinder body includes a hollow circular tube (11), and end covers (12) are respectively connected to both ends of the circular tube (11). A second mounting hole for the PTC heating pipe (7) to pass through is provided on any one of the end covers (12), and one end of the PTC heating pipe (7) is connected with a connecting flange (13), and the connecting flange (13) is detachably connected to the end cover (12) provided with the second mounting hole.

4. The PTC heating component for commercial dishwashers according to claim 1, wherein: Both the first detection element (8) and the second detection element (9) are temperature sensing probes, and the detection ends of the two temperature sensing probes respectively pass through the side wall of the cylinder body and extend into the water inlet chamber (1) and the water outlet chamber (3).

5. The PTC heating component for commercial dishwashers according to claim 1 or 2 or 4, characterized in that: The cylinder body is horizontally arranged along its length direction, and a drain bolt (14) communicating with any one of the chambers is also provided on the side wall at the bottom of the cylinder body.

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